mjb1416 wrote in Sat May 21, 2016 5:47 pm:[...] but presumably actual airspeed and indicated airspeed are not quite the same thing.

The difference between indicated airspeed, IAS, and true airspeed, TAS, vary a lot in particular with altitude, but also temperature.* And of course both of them usually differ from the ground speed, GS.

* This calculation is probably what pilot cadets/students most often use their flight computer (E-6B/CR disc/nav disc/whiz wheel) for next to wind calculations.

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